1. TERs
   TARs
2. TIRs

Runaway truck ramps are also referred to as TERs. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. Truck escape ramp
   Truck exiting ramp
2. None of the above

TER stands for truck escape ramp. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. Flat highways
   Highways that traverse steep downgrades
2. Four-lane highways

TERs are found on highways that traverse steep downgrades. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. Drivers with big trucks only
   Drivers with overheated and malfunctioning brakes
2. None of the above

Contrary to what their name implies, TERs aren't just for folks driving big rigs. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. When braking problems arise in regions of heavy traffic on short but steep hills
   In sparsely inhabited mountain regions on long grades
2. All of the above

Drivers with overheated and malfunctioning brakes mainly find runaway truck ramps useful in two situations: when braking problems arise in regions of heavy traffic on short but steep hills and in sparsely inhabited mountain regions on long grades. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. 40 years
   60 years
2. 80 years

For more than 40 years, runaway truck ramps have been constructed in areas where frequent accidents involving big trucks have occurred. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. In areas where frequent accidents involving big trucks occur
   In high-traffic areas
2. In heavily populated areas
   All of the above

TERs are constructed in areas where frequent accidents involving big trucks have occurred. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. Colorado
   Oklahoma
2. Illinois
   Indiana

Although TERs can be constructed anywhere, they are most often located in mountainous states. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. Rounded gravel from riverbeds
   Crushed gravel
2. None of the above

Studies have determined that these beds are more effective in slowing and stopping vehicles if rounded gravel from riverbeds is used, rather than crushed gravel. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>

1. Right side
   Left side
2. Middle

TERs are usually located to the right of the roadway. <a href="http://auto.howstuffworks.com/auto-parts/brakes/brake-problems/brake-failure.htm">How Brake Failure Works</a>